Formaldehyde Decomposition from −20 °C to Room Temperature on a Mn–Mullite YMn2O5 Catalyst

• DOI: 10.1021/acs.est.2c07843
• Publication Date: 2022-12-06T19:46:45Z
• Authors: Fangxie Shen; Xiang Wan; Lijing Wang; Chunning Zhao; Shen Zhang; Anqi Dong; Kai Shi; Haijun Zhang; Xiaomeng Zhou; Kunpeng He; Yinchang Feng; Weichao Wang
• Keywords: Mullite

Large ambient temperature changes (−20–>25 °C) bring great challenges to the purification of indoor pollutant formaldehyde. Within such a large range, we herein report manganese-based strategy, that is, mullite catalyst (YMn2O5) + ozone, efficiently remove formaldehyde pollution. At −20 °C, removal efficiency reaches 62% under condition 60,000 mL gcat–1 h–1. As reaction is increased −5 and ozone are completely converted into CO2, H2O, O2, respectively. Such remarkable performance was ascribed highly reactive oxygen species generated by on YMn2O5 surface based low temperature-programed desorption measurements. The in situ infrared spectra showed intermediate product carboxyl group (−COOH) be key species. Based superior performance, built consumable-free air purifier equipped with mullite-coated ceramics. In simulated (25 °C 30% relative humidity), equipment can effectively decompose (150 m3 h–1) without producing secondary pollutants, rivaling commercial efficiency. This work provides an route range °C).